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Projection apparatus, projection system and spectacle-type display apparatus

a projection system and display apparatus technology, applied in the direction of reflex reflectors, polarising elements, instruments, etc., can solve the problem of low brightness of projected video images

Active Publication Date: 2019-09-24
COLORLINK JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The patent text describes a new invention that may have various features. It may also be a combination of existing features. The technical effect of the invention is to improve upon existing technologies and provide new solutions.

Problems solved by technology

However, with the conventional method, the video image from the projector reaches an observer after being weakened by the half mirror, and therefore the displayed video image has low brightness due to large loss of video image light.

Method used

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  • Projection apparatus, projection system and spectacle-type display apparatus
  • Projection apparatus, projection system and spectacle-type display apparatus
  • Projection apparatus, projection system and spectacle-type display apparatus

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Embodiment Construction

[0020]Hereinafter, (some) embodiment(s) of the present invention will be described. The embodiment(s) do(es) not limit the invention according to the claims, and all the combinations of the features described in the embodiment(s) are not necessarily essential to means provided by aspects of the invention.

[0021]FIG. 1 shows an example of a projection system 10 according to the present embodiment. In the projection system 10, a projection image is output from the vicinity of an observer, and the output projection image is retro-reflected to be observed by the observer. The projection system 10 includes a projection apparatus 100 and a retro-reflective element 190.

[0022]The projection apparatus 100 outputs the projection image toward the retro-reflective element 190. The projection apparatus 100 includes an image generating unit 110, a projection unit 120, a retardation plate 130 and a reflective polarizing plate 140.

[0023]The image generating unit 110 generates image data of the proje...

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Abstract

A projection system is provided, including: a projection unit to output a projection image; a retardation plate arranged obliquely with respect to an optical axis of the projection image, the retardation plate to modulate a polarization state of the projection image incident thereon; a reflective polarizing plate stacked on a side of the retardation plate opposite to that on which the projection image is incident, the reflective polarizing plate to reflect a first polarization component of the projection image transmitted through the retardation plate; and a retro-reflective element provided along a direction in which the projection image is reflected by the reflective polarizing plate, the retro-reflective element to output reflected light against a direction in which the light is incident, wherein the reflective polarizing plate transmits a second polarization component of the projection image reflected by the retro-reflective element and modulated by the retardation plate.

Description

[0001]The contents of the following Japanese patent application(s) are incorporated herein by reference:[0002]No. PCT / JP2016 / 061743 filed on Apr. 11, 2016.BACKGROUND1. Technical Field[0003]The present invention relates to a projection apparatus, a projection system and a spectacle-type display apparatus.2. Related Art[0004]Retro-reflective projection technology has been known, in which a virtual object is displayed by projecting a video image from a projector onto a retro-reflective element via a half mirror (see Non-Patent Document 1 and Patent Document 1).Image displaying apparatuses using a polarizing beam splitter has also been known (see Patent Documents 2 and 3).[0005]Non-Patent Document 1: S. Tachi, Telexistence and Retro-reflective Projection Technology (RPT), Proceedings of the 5th Virtual Reality International Conference (VRIC2003) pp. 69 / 1-69 / 9, Laval Virtual 2003, France, May 13-18, 2003[0006]Patent Document 1: Japanese Patent Application Publication No. 2000-122176[0007...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03B21/28G02B27/01F21V8/00G03B21/14G02B27/26G02B5/30G02B30/25
CPCG02B6/0056G03B21/28G03B21/14G02B27/26G02B27/0172G02B5/3025G03B21/2073G03B35/26G02B5/13G02B2027/0134G02B5/3041G02B30/25
Inventor IIGAHAMA, YUKIOSASAGAWA, MASAYUKI
Owner COLORLINK JAPAN